Is telomere length a reliable measure of health/lifespan?Please note that I did never say that it is reliable. So I don't understand in what you disagree exactly. I also referred that are many factors that alter the size of the temolere, as you did. Just because I did not stated "It is not reliable" I also did not say "It is reliable". That was my mistake to not make this point clear. But it is true that it gives a rough idea of lifespan (I said rough, not accurate!)